Find the equation of the circle touching the x-axis and passing through the points (7,-2) and (0,-9).

Please help me with this and show the solution... Thanks!

from the given points it can be seen that the circle touches both the axes. also the circle lies in the fourth quadrant.now since the axes are tangents the centre of the circle lies on y=-x. so the centre is (9,-9). you are given 2 points. so calculate the radius. then using circles equation get the required equation.